Indonesian Volcano Erupts 77 Times in 24 Hours

Mount Sinabung on Highest Alert Status

JAKARTA, Indonesia—A volcano on Indonesia's Sumatra island erupted at least 77 times over the weekend, sending clouds of potentially deadly superheated gas barreling down the mountain and forcing the evacuation of more villages in the highly populated area.

Mount Sinabung has displaced nearly 20,000 people from their homes since sporadic eruptions began in September. Experts have placed it under the highest alert status among the 127...